package com.qf.controlle;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;

import com.qf.common.MyThreadLocal;
import com.qf.common.R;
import com.qf.entity.ShoppingCart;
import com.qf.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

/**
 * 购物车
 */
@Slf4j
@RestController
@RequestMapping("/shoppingCart")
public class ShoppingCartController {

    @Autowired
    private ShoppingCartService shoppingCartService;

    /**
     * 添加购物车
     *
     * @param shoppingCart
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart) {
        log.info("购物车数据:{}", shoppingCart);

        //设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = MyThreadLocal.getCreateUser();
        shoppingCart.setUserId(currentId);
        //菜品id
        Long dishId = shoppingCart.getDishId();

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, currentId);

        if (dishId != null) {
            //添加到购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId, dishId);
        } else {
            //添加到购物车的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId, shoppingCart.getSetmealId());
        }

        //查询当前菜品或者套餐是否在购物车中
        //SQL:select * from shopping_cart where user_id = ? and dish_id/setmeal_id = ?
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        if (cartServiceOne != null) {
            //如果已经存在，就在原来数量基础上加一
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number + 1);
            shoppingCartService.updateById(cartServiceOne);
        } else {
            //如果不存在，则添加到购物车，数量默认就是一
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }
        return R.success(cartServiceOne);
    }


    /**
     * 查看购物车
     *
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list() {
        log.info("查看购物车...");
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, MyThreadLocal.getCreateUser());
        queryWrapper.orderByAsc(ShoppingCart::getCreateTime);

        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);

        return R.success(list);
    }


    /**
     * 根据用户id清空购物车
     *
     * @return
     */
    @DeleteMapping("/clean")
    public R clean() {
        //从session中得到登录用户id
        Long user = MyThreadLocal.getCreateUser();
        //条件:根据该用户的id清空
        LambdaQueryWrapper<ShoppingCart> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(ShoppingCart::getUserId, user);
        boolean remove = shoppingCartService.remove(wrapper);

        if (remove) {
            return R.success("清空成功");
        }
        return R.error("清空失败");
    }


    @PostMapping("/sub")
    public R sub(@RequestBody ShoppingCart shoppingCart) {
        //检查参数
        if (shoppingCart == null) {
            return R.error("参数异常");
        }
        //减少商品方法
        boolean sub = shoppingCartService.sub(shoppingCart);
        if (sub == false) {
            return R.error("减少失败");
        }
        return R.success("减少成功");
    }


}